senator john mccain a vocal critic of the obama's administration's response to the attack said clinton's answers left him unsatisfied. >> the american people and the families of these four brave americans still have not gotten the answers that they deserve. >> reporter: secretary clinton connected what happened in benghazi to the rise of al qaeda in mali and the recent terror attack in algeria. right now she's making what may be her final appearance on capitol hill introducing john kerry at his confirmation hearing. he is likely to be asked how he would handle those threats as the next secretary of state. >> margaret brennan thank you. "washington post" columnist david ignatius had written extensively about the engazie attacks. good morning. >> good morning, charlie. >> we begin with the questions, whether secretary of state took responsibility, answered all the questions and put this behind her? >> she gave a good account of herself, she gave as good as she got. it was an intense session. i think on the sound bite that we'll remember secretary clinton asking what difference does it make